CHICAGO — It was late Tuesday night, and Caitlin O’Hearn was standing in a concourse here at Guaranteed Rate Field. She wore her older brother’s blue jersey on her back, and she shook her head once, and she looked back down the long row of stairs, to the row behind the dugout filled with family.

“It was insane,” she said. “Insane.”

Caitlin O’Hearn is the sister of Ryan O’Hearn, 25, who debuted for the Royals here Tuesday night. She also lives in Chicago, a flight attendant with a home base near Wrigley Field. On Sunday night, she heard that her older brother had been called up to the major leagues, a lifelong dream fulfilled. But that wasn’t the best part. His first game would be on the South Side against the White Sox. And the entire family was coming to town.

Older brother Michael Reid was on his way from Florida. Her parents, Tom and Christine, were making travel plans. They would all be there Tuesday night.